Personal trainer Gabby saw her app launch to the top of the iTunes chart, weeks before Kady released hers.

Kady has insisted the apps aren’t comparable and claims her project was in production while Gabby was in the Love Island villa last year.

Kady McDermott is excited about what's in store in the New Year [Vivienne Edge Photography/ Body Goals By Kady]

Gabby Allen worked as Personal Trainer before joining Love Island[Instagram]

Marcel Somerville’s girlfriend has since explained her rival should be "worried" about the success of her app.

"In the position we’re in now there’s a few certain routes people can go down. I was never going do the fashion route because I’m 5ft 2ins and hate doing that stuff," Gabby told The Sun Online.

"A lot of reality stars go into fitness because everyone’s got good bodies and if you can, why not? I would never bring anyone else down in order to get myself a little bit further."

The Love Island star has been showing off her apps as inspiration for Shape Up fan on social media [Instagram]

Gabby continued: "There’s enough people in the world for all of us to have. If anything, if people are trying to to knock me down then they’re obviously a little bit worried. I am a personal trainer I don’t need to have anyone’s input."

Kady has previously said of Gabby’s app that she used "a template" to create it, while her own "took six months" to develop.

Speaking to OK! Online ahead of the launch of her app, Kady said: "My fitness app is launching in January which I am so excited for because I've spent months and months on this.

Kady McDermott launched her fitness app around the same time as Gabby Allen [Kady McDermott/Instagram]

"I’ve never spoken to Gabby, but she is a PT so I was expecting her to release something fitness related.